﻿//*********************************************************
//
// Copyright (c) Microsoft. All rights reserved.
// This code is licensed under the MIT License (MIT).
// THIS CODE IS PROVIDED *AS IS* WITHOUT WARRANTY OF
// ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING ANY
// IMPLIED WARRANTIES OF FITNESS FOR A PARTICULAR
// PURPOSE, MERCHANTABILITY, OR NON-INFRINGEMENT.
//
//*********************************************************

using System;
using Windows.ApplicationModel;
using System.Threading.Tasks;
using Windows.ApplicationModel.Activation;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Navigation;

// The Blank Application template is documented at http://go.microsoft.com/fwlink/?LinkId=402347&clcid=0x409

namespace SDKTemplate
{
    /// <summary>
    /// Provides application-specific behavior to supplement the default Application class.
    /// </summary>
    sealed partial class App : Application
    {
        /// <summary>
        /// Initializes the singleton application object.  This is the first line of authored code
        /// executed, and as such is the logical equivalent of main() or WinMain().
        /// </summary>
        public App()
        {
            this.InitializeComponent();
            this.Construct();
        }

        /// <summary>
        /// Invoked when the application is launched normally by the end user.  Other entry points
        /// will be used when the application is launched to open a specific file, to display
        /// search results, and so forth.
        /// </summary>
        /// <param name="e">Details about the launch request and process.</param>
        protected override void OnLaunched(LaunchActivatedEventArgs e)
        {
#if DEBUG
            if (System.Diagnostics.Debugger.IsAttached)
            {
                this.DebugSettings.EnableFrameRateCounter = false;
            }
#endif

            // A sample can inject code into OnLaunched by implementing OverrideOnLaunched.
            bool handled = false;
            OverrideOnLaunched(e, ref handled);

            if (!handled)
            {
                // We don't have the specified view in the collection, likely because it's the main view
                // that got shown. Set up the main view to display.
                InitializeMainPage(e.PreviousExecutionState, "");

                // This is the usual path at application startup
                Window.Current.Activate();
            }
        }

        private void InitializeMainPage(ApplicationExecutionState previousExecutionState, String arguments)
        {
            Frame rootFrame = CreateRootFrame();

            if (rootFrame.Content == null || !string.IsNullOrEmpty(arguments))
            {
                // When the navigation stack isn't restored or there are launch arguments
                // indicating an alternate launch (e.g.: via toast or secondary tile), 
                // navigate to the appropriate page, configuring the new page by passing required 
                // information as a navigation parameter
                rootFrame.Navigate(typeof(MainPage), arguments);
            }
        }

        private Frame CreateRootFrame()
        {
            Frame rootFrame = Window.Current.Content as Frame;

            // Do not repeat app initialization when the Window already has content,
            // just ensure that the window is active
            if (rootFrame == null)
            {
                // Create a Frame to act as the navigation context and navigate to the first page
                rootFrame = new Frame();

                // Set the default language
                rootFrame.Language = Windows.Globalization.ApplicationLanguages.Languages[0];
                rootFrame.NavigationFailed += OnNavigationFailed;

                InitializeRootFrame(rootFrame);

                // Place the frame in the current Window
                Window.Current.Content = rootFrame;
            }

            return rootFrame;
        }

        /// <summary>
        /// Invoked when Navigation to a certain page fails
        /// </summary>
        /// <param name="sender">The Frame which failed navigation</param>
        /// <param name="e">Details about the navigation failure</param>
        void OnNavigationFailed(object sender, NavigationFailedEventArgs e)
        {
            throw new Exception("Failed to load Page " + e.SourcePageType.FullName);
        }

        // Add any application contructor code in here.
        partial void Construct();

        // Hook into OnLaunched here.
        partial void OverrideOnLaunched(LaunchActivatedEventArgs args, ref bool handled);

        // Hook into InitializeMainPage here.
        partial void InitializeRootFrame(Frame frame);
    }
}
